反应详情

A solution of (6-bromo-thiochroman-4-yl-oxy)-tert-butyl-dimethyl-silane (Intermediate-K3) (2.74 g, 7.64 mmol) in THF (30 mL) was treated with nBuLi (3.1 mL of a 2.5 M soln) at −78° C. for 30 m. A solution of 2-(tert-butyl-dimethyl-silanyl)-5-formyl-imidazole-1-sulfonic acid dimethylamide (see the General Method above, Intermediate K1) (2.42 g, 7.63 mmol) in THF (10 mL) was added via cannula. After 15 m, the reaction mixture was allowed to warm to rt for 16 h. The mixture was quenched with water, washed with brine and dried over Na2SO4. The solvent was removed and the residue was purified by chromatography on silica gel with 20% EtOAc:hexane to afford 2-(tert-butyl-dimethyl-silanyl)-5-{[4-(tert-butyl-dimethyl-silanyloxy)-thiochroman-6-yl]-hydroxy-methyl}-imidazole-1-sulfonic acid dimethylamide (Intermediate K4) as an oil, 4.12 g.

1. additionwas added via cannula
2. customThe mixture was quenched with water
3. washwashed with brine
4. dry with materialdried over Na2SO4
5. customThe solvent was removed
6. customthe residue was purified by chromatography on silica gel with 20% EtOAc